Dissertations / Theses on the topic 'Building under construction'

The aim of this research is to develop a coupled thermo-mechanical damage model for implementation in finite element software in support of fire-induced collapse assessment of steel structures. The need for properly modelling steel deterioration behaviour remains a challenging task in structural fire engineering because of the complexity inherent in the damage states of steel at large strains and high temperatures. A fully three-dimensional damage-coupled constitutive model is developed based on the hypothesis of effective space elastoplasticity and isotropic damage theory. The coupled damage is simulated by a coupling formulation between a mechanical damage component and a thermal damage component in attempt to capture the coupled damage growth under combined actions of mechanical loading and fire loading. The proposed damage model comprises a limited number of parameters that could be identified at unloading slopes of stress-strain relationships through tensile coupon tests. Alternatively, an inverse analysis type of calibration procedure could be adopted when coupon test data is unavailable. The proposed damage model is successfully implemented in the finite element software ABAQUS and calibrated with a comprehensive range of experimental results and established numerical results. The damage-affected structural response is accurately reproduced under various loading conditions and a wide temperature range, demonstrating that the proposed damage model is a useful tool in giving a realistic representation of steel deterioration behaviour under combined actions of fire and mechanical loads. Three-dimensional FE models of a five-storey and a ten-storey steel-framed office building are developed in ABAQUS and the proposed damage model is adopted in assessing their susceptibility to progressive collapse. Three types of accidental scenarios are investigated : (i) fire only scenario, (ii) post-blast fire scenario, and (iii) fire-triggered explosion scenario. The location of the compartment where triggering loads occur is varied and the most vulnerable location is at the mid-height of both building systems. Estimation of ultimate failure time by incorporating damage model with the suggested damage parameter set has the potential to be utilized as a useful tool in helping designers to determine how much time is realistically available for evacuation before progressive collapse occurs in this type of buildings. Results show that the proposed damage model significantly affects the limit state of steel buildings under fire, and especially under combined actions of blast and fire. Compared to conventional numerical approaches, the consideration of coupled thermo-mechanical damage accumulation results in an 8.25% ∼ 23.47% decrease of collapse resisting time. A key finding from this study is that the alternative load path, which is a crucial factor in deciding the survival of buildings upon local column failure, may be severely compromised due to the coupled thermo-mechanical damage propagation in surrounding columns. Based on the identified collapse mechanisms, effective strategies are suggested to improve the survivability of buildings under blast and fire.

This thesis provides an investigation into the structural behaviour of cold-formed steel zed- and channel-section purlins when subjected to uplift loading in purlin-sheeting systems. In pre-buckling, an analytical model is presented to describe the bending and twisting behaviour of partially restrained zed- and channel-section purlins when subjected to uplift loading. Formulae used to calculate the bending stresses of the roof purlins are derived by using the classical bending theory of thin-walled beams. Detailed comparisons are made between the present model and the simplified model proposed in Eurocode EN1993-1-3. In buckling, a numerical investigation is presented on the buckling behaviour of partially restrained cold formed steel zed- and channel-section purlins when subject to transverse distributed uplift loading. The buckling behaviour of zed- and channel-section purlins of different dimensions subjected to uplift loading under the influence of rotational spring stiffness applied on the middle line of the upper flange is examined. In the post-buckling, nonlinear finite element analysis models are created for the partially restrained cold-formed steel zed- and channel-section purlins subjected to transverse uniformly distributed uplift loading. The analyses are performed by considering both geometric and material nonlinearities, and corresponding design curves of zed- and channel-section purlins are established.

Supplemental passive dampers are generally considered as an effective tool to control the seismic response of multi-storey buildings. Since the optimum placement of passive dampers in buildings can potentially improve the structural performance or reduce construction cost, there is an increasing number of researchers engaged to optimize the damper placement in buildings. Given that a large number of studies have been conducted to investigate damper placement methods, a systematic method or a clear conclusion for strategically distributing dampers in buildings is not presented in any building guidelines. The main limitations of current damper placement studies may include the lack of focus on collapse resistance of retrofitted buildings, on beam and column nonlinear behaviors, and the lack of considering the variations of earthquake characteristics and intensity levels. The fundamental damper placement issue can be separated as the distribution of dampers throughout the height of the buildings and the distribution of dampers in different bays in building frames. In this research, both distributions are explored and their effect on the collapse performances of buildings under strong earthquakes is thoroughly studied. The effectiveness of advanced damper placement approaches is evaluated by comparisons with classical damper placement methods. Considering the uncertainty in earthquake ground motion characteristics, multiple ground motions scaled to various intensity levels are involved to evaluate the seismic performance of buildings. Finally, major conclusions towards the philosophy of the strategic damper placement in practical building constructions are presented in terms of the overall structural performance under strong ground motions.

NCC Construction är en del av NCC koncernen och är ett av de största byggföretagen i Sverige idag. Detta examensarbete är utfört i samarbete med NCC Construction i Karlstad och behandlar ämnet miljömedvetenhet. Uppgiften var att studera och analysera de anställda med hänsyn till deras miljöpolicy samt att uppskatta hur väl företaget når ut med sin information, samt att ta fram olika förslag på förbättringar i NCCs pågående miljöarbete.

NCCs miljöpolicy har fyra övergripande mål och det finns klart och tydligt nerskrivet vad den anställde är skyldig att bidra med i sitt arbete med hänsyn till företagets strävan mot en bättre miljö. Behovet av en väl formulerad miljöpolicy är väsentligt då det är denna som beskriver vilka mål som finns och hur dessa ska uppnås.

För att få fram svar på min frågeställning utfördes en enkätundersökning där arbetsledning, byggnadsarbetare samt underentreprenörer var målgruppen. Denna undersökning var anonym och analyserades med hänsyn till position, ålder och antal år i företaget.

Resultatet i denna undersökning visar på stor förståelse hos de anställda inför miljöfrågor. Det de behöver sträva efter för att bli ännu bättre är att minska sina resor och transporter. Andelen miljömedvetna var högst bland underentreprenörerna eftersom de planerar sina transporter och samåker mer. Miljökurser är något återkommande i företaget, däremot bör de vara mer utspridda bland de olika grupperna. Även de som arbetat några år behöver genomgå en kurs för att uppdateras. För att öka förståelsen behöver varje anställd informeras om lagar, regler och policy kontinuerligt. Detta kan ske genom olika medier, exempelvis informationsblad eller i en dialog med sin chef.

Vid analysen av de anställdas förslag på vad som kan förbättras visades det tydligt att de flesta i princip hade liknande förslag, vilket till största delen innefattade transportfrågan.

Sammanfattningsvis kan det sägas att NCC arbetar mot en bättre miljö genom sitt företag och sina anställda. För att höja sig ett snäpp behövs dock mer utförlig information och då även till underentreprenörerna, samt att reducera sina transporter till och från arbetsplatserna.

NCC Construction is one of the largest construction companies in Sweden today and this thesis is written in cooperation with NCC Construction in Karlstad and discusses the environmental awareness throughout the company. The task was to study and analyze how the employees perceive their environmental policy and to estimate how successful the distribution of information was. There was also an interest in collecting new ideas from the employees in how to make environmental improvements.

NCC has four comprehensive goals with their policy and it is well documented what the employers is obliged do to in terms of making the company more environmental friendly. A well written policy is essential to describe the goals and how to fulfill them.

In the matter of receiving answers to my questions a survey was made and the target group was the group management and the workers. The survey was to be analyzed according to their position in the company, age and the number of years they have been at NCC.

The result of this survey shows a good sense of understanding among the employees in the environmental matter. One thing the company needs to work on is reducing their travels and transports. The highest amount of environmental awareness is among their contractors and that is because they know how to plan their transports and use car pools more often. NCC are using environmental classes to educate their employees, but they need to give everyone the opportunity not only certain groups, also the ones with a few years in the company needs to update their memory. To increase their understanding among the employees they need to be informed about laws, rules and policies continuously.

Analyzing the employees’ suggestions of improvements shows that they all had almost the same ideas, reduce the transportation.

To sum it up you can easily say that NCC are working through their company and employees to make a difference in the environment, one thing they still need to work on is making sure the information reaches everyone.

Research relating to the potential impacts of climate change on UK housing has increased in recent years. The future performance of dwellings that are currently considered sustainable may change under a changing climate. For example, well insulated, air tight homes that are energy efficient and comfortable now may be at risk of overheating in the future. Decision-making for sustainable house designs may become more challenging regarding dwellings that will perform well now and be resilient to climate change risks, such as overheating, in the future. This study evaluates the effect of overheating risk and future climatic uncertainty in designing UK dwellings. The main focus of the research is on the thermal performance of the external building envelope. The foremost aim is to future proof current designs in order to provide the best possible thermal comfort under likely warmer weather conditions produced by climate change. This research examines a number of constructional design options to reduce energy consumption and improve thermal comfort on the basis of climate change predictions up to 2080. The study develops a methodology by means of computer simulations to assess and predict the performance (in terms of total energy input, both heating and cooling, required to maintain thermal comfort) in a range of current, ‘high performance’ construction systems used on simple and typical UK house models in London and Manchester. The findings of this study show that UK sustainable homes, in their present format, are susceptible to a future overheating risk. It is argued that the substantial part of the overheating risk can be alleviated by the integration of modern smart materials and conventional design solutions, such as shading devices and earth-to-air heat exchangers (EAHE). The research also proposes a new method of integrating phase change materials into the building envelope to reduce domestic cooling loads and overheating hours in the coming decades.

According to current climate change predictions for the UK, summers are expected to become dryer and hotter in the future. This has potentially serious implications for overheating of naturally ventilated office buildings, many of which already fail to perform under current heatwave conditions. This thesis addresses the summer performance of such buildings under current and future climates by means of building performance simulation. Current industry standard weather datasets for building performance simulation are not however, suited to the assessment of the potential impacts of a changing climate. This work describes the integration of future climate scenarios into widely used weather file formats and critically assesses the resulting weather datasets. Simulations of a case study building at the University of Southampton highlight the potential impact of climate change on future summer overheating inside naturally ventilated buildings. The results of these simulations are compared to monitored data from the case study building during an extended heatwave period in the summer of 2006. It is shown that the present day performance of a naturally ventilated building under an extended heatwave period can give an indication of its likely performance during a projected typical hot summer in the 2050’s under a medium-high emissions scenario. A second case study building serves to highlight that building designs and building services solutions which are suitable for retaining acceptable indoor comfort levels during current heatwave periods, are likely to be suitable to alleviate summer overheating under the predicted warmer future climates. Further simulations, encompassing various locations throughout the UK emphasize the need for timely refurbishment of naturally ventilated office buildings within the next few decades to avoid increasing numbers of existing buildings failing to perform under the predicted future summer conditions.

Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 127-131). Also available in electronic version. Access restricted to campus users.

For reinforced concrete structures subjected to chlorides, carbon dioxide laden and other aggressive environments, corrosion of the reinforcing steel is seen as a global problem. Maintenance and repairs resulting primarily from premature concrete cracking and spalling have an estimated cost running to $100 billion per annum world-wide. The continual demands for greater load carrying capacity of existing infrastructure only exacerbate the problem. In practice, concrete crack width propagation is seen as one of the most important criteria for design and assessment of the long term serviceability of concrete structures. It is therefore economically beneficial to have a fundamental understanding of the growth of the crack width over time so that better informed decisions can be made regarding the carrying out of any repairs. This research attempts to examine the process of concrete cracking and determine the surface crack width of concrete structures under the combined effects of reinforcement corrosion and applied load in both an analytical and numerical manner. In the analytical method, a model for stiffness reduction of cracked concrete has been derived based on the concept of fracture energy and an analytical solution has been obtained. In the numerical method, an interfacial element has been developed to predict concrete crack width under combined effects based on a cohesive crack model in conjunction with finite element codes. To help accurate prediction of crack width in the numerical method, a realistic constitutive relationship for concrete under direct tension has been obtained from the laboratory experiments. It is concluded in this thesis that both the analytical and numerical methods are one of very few available theoretical methods that can predict with reasonable accuracy concrete crack width of reinforced concrete structures under the combined effects of reinforcement corrosion and applied load. This research focuses on concrete cracking caused by reinforcement corrosion and applied load without considering other factors, e.g., weathering, freeze-thaw and chemical attack. Both methods can be used as a tool to assess the serviceability of corrosion affected concrete infrastructure if reinforcement corrosion and applied load are the main causal factors of concrete cracking. For this type of concrete structures, therefore, scientific information can be provided for asset managers in decision making regarding possible interventions. Timely interventions have the potential to prolong the service life of reinforced concrete structures.

Problem background: During a construction project, the environment is negatively affected due to all construction waste that occurs. Even during the manufacture of building materials, the environment is affected. Construction waste in Sweden is about 31 percent, it is quite high, but they are constantly trying to reduce construction waste and the environmental impact that the construction sector is responsible for. The construction waste that takes place has a direct connection to building materials, which also has a direct connection to the carbon dioxide emission in the production of these building materials. Therefore, in this work we have addressed these three points that focus on the environmental impact that the construction industry has in a construction project. The purpose of the work is to investigate how the construction industry affects the environment. Because it is a complicated industry where a lot happens. For example, there are several different types of transport both from and to the construction site that leads to increased carbon dioxide emissions. To reduce construction waste, you must have the knowledge as to know why construction waste occurs and be able to apply the waste hierarchy during a construction project for reduced environmental impact. The methodology for completing this work was due to various scientific articles and literature studies used, via Mälardalens University's library database. In addition, some interviews were conducted that helped strengthen and complete the work. The interviews provided different views and perspectives and explained in detail how construction waste is handled during a construction project. The survey provided a better insight into how this is done, handled and what solutions are available to reduce the construction sector's environmental impact during a construction project. The end results of the work showed that there are some methods you can use to reduce the environmental impact that the construction industry has today. With these methods, it is not only the environment that has a positive effect but also the construction company because it leads to lower costs and more efficient construction methods. The results also showed that the construction industry is a complicated industry where a lot affects each other and that they always try to reduce their environmental impact by constantly striving for their environmental goals. The Conclusions of the work is that the environment affects the construction industry in different ways. Everyone involved is trying to reduce their influence, but there are some challenges that exists and should be addressed. The work highlights the problem and alternative solutions that the construction industry can use to reduce their environmental impact.

Syfte: Studien avser energiförbrukning i produktionsfasen och fokuserar på hur kommunikationen kring energiförbrukningen kan minska den. Mycket fokus läggs idag på att minska en byggnads energiförbrukning under förvaltningsskedet, medan det finns saknat fokus kring produktionsfasens energiförbrukning. En av de största svårigheterna med en hållbar utveckling i byggsektorn är att varje projekt är unikt, vilket gör det svårt för inblandade parter att lära sig från tidigare erfarenheter och dela kunskap mellan olika projekt och aktörer, varvid vikten av en fungerande kommunikation ökar. Målet med denna studie är därför att minska byggproduktionens miljöpåverkan gällande energiförbrukning, genom att förbättra kommunikationen mellan inblandade parter. Metod: Denna studie är utförd som en fallstudie för ett specifikt projekt hos en av Sveriges största bygg- och fastighetsutvecklingsföretag. Metoder för att besvara studiens frågeställningar och samla empiri är litteraturstudier, dokumentanalys av interna dokument och intervjuer med inblandade parter i produktionsfasen. Resultat: Då den mesta kommunikationen kring miljöfrågor sker centralt och det finns en osäkerhet kring vems ansvar miljöfrågan ligger under ett projekt, leder till att det blir en personfråga och påverkas av hur stort intresse involverade personer har i miljö och hållbarhet. Resultatet visar att det i dagsläget läggs lite fokus på energiförbrukning under produktionsfasen. Byggtorkning är det moment med högst energiförbrukning och har därmed störst potential att minska dess koldioxidutsläpp. Konsekvenser: Studien visar att personligt intresse för miljö, prioritering samt tilldelning av resurser kan minska på energiförbrukningen under ett projekt. Genom att detta omfattas av KMA-samordnarens arbetsuppgifter innebär det att frågan adresseras och att energibesparingar kan göras. Begränsningar: Studien begränsas till större entreprenadföretag och studerar enbart energiförbrukningen från arbetsmomenten grundläggning, stombyggnad och yttre stomkomplettering i produktionsfasen på en platsbyggd betongstomme. Studien tar sålunda inte hänsyn till energiförbrukning av den tillfälliga fabriken. Respondenter till intervjuer har valts utifrån sakkunnighet och involveringsgrad i energieffektivisering på byggarbetsplatsen.
Purpose: The study addresses energy consumption in the production phase and focuses on how communication about energy consumption can reduce it. Most focus is currently on reducing the energy consumption of a building during the operation phase, while there is a lack of focus on the energy consumption in the production phase. One of the biggest difficulties with sustainable development in the construction industry is that each project is unique, making it difficult for parties involved to learn from previous experiences and share knowledge between different projects and actors, thereby increasing the importance of a working communication. The aim of this study is therefore to reduce the environmental impact of the construction phase concerning energy consumption, by improving communication between parties involved. Method: This study is performed as a case study for a specific project at one of the largest construction and property development companies in Sweden. Methods to answer the questions of the study and gather empirical data are literature studies, document analysis and interviews with parties involved in the production phase. Findings: Since most of the communication is handled centrally and there is an uncertainty about whose responsibility the environmental issue is during a project, it becomes a personalized question and depending on the personal interest for the environment and sustainability is for the people involved. The results show that there is currently a lack of focus on the energy consumption during the production phase. The drying of the concrete structure is the phase with the highest energy consumption and therefore has the greatest potential for reducing its carbon dioxide emissions. Implications: The study shows that personal interest for the environment, prioritization and allocation of resources can reduce energy consumption during a project. By including this in the QHSE-coordinator's tasks, implies in addressing the issue and energy savings can be made. Limitations: The study is limited to major contractors and only studies the energy consumption from the work stages foundation, framing and lock up in the production phase of a site-built concrete frame. The study does not therefore consider the energy consumption of the temporary factory. Respondents to the interviews have been selected based on expertise and involvement in energy efficiency at the construction site.

Vid en brand på byggarbetsplatsen finns det risk för personskador, skador på egendom och att byggproduktionen hamnar i ett driftstopp som kan bli kostsamt. Det finns brister vid planeringen av brandskyddet under byggtid (BUB) och vid olika arbetsmoment på byggarbetsplatsen. Planeringen av BUB behöver förbättras utefter hur en byggarbetsplats, och således brandrisker, förändras under byggproduktionen. Ett förslag på hur detta skulle kunna förbättras är att BUB är med i produktionsplaneringen och redovisas på arbetsplatsdispositionsplaner (APD-planer). Arbetsmoment som kan vara en brandrisk borde också planeras tillsammans med BUB för en brandsäkrare byggarbetsplats. Brandskyddsprojektering är idag till stor del inte inkluderat i det digitala arbetssättet som Building Information Modeling (BIM) innebär. Att brandkonsulten inte är med och arbetar i BIM leder till att de fördelar som finns med samverkan mellan olika discipliner inte kan utnyttjas. Den forskning som finns rörande brandskydd i BIM idag fokuserar på projektering av den färdiga byggnaden och hur brandskydd ska kunna inkluderas i BIM. Det finns idag ingen forskning som berör både brandskydd på byggarbetsplatsen och BIM-projektering av byggarbetsplatsen. Detta leder till ett kunskapsglapp mellan BIM som arbetssätt på byggarbetsplatsen och planering av BUB. På grund av de påträffade problemområdena syftade studien till att undersöka förbättringsmöjligheter för brandskyddet under byggtid. Detta genom att kartlägga förutsättningar och tillämpbara områden där BUB kan inkluderas i arbetet med APD-planer och tidsberoende BIM-modeller. Målet med studien var att framta ett underlag till framtida arbetsmetoder där BUB, APD-planer och BIM på byggarbetsplatser används tillsammans. För att uppfylla syftet utfördes en litteraturstudie och en intervjustudie. Litteraturstudien gjordes för att granska publicerat material rörande BUB, byggarbetsplatsplanering med APD-planer samt BIM på byggarbetsplatsen och BIM med hänsyn till brandskydd. Intervjustudien gjordes för att få en inblick i hur personer använder sig av BUB, APD-planer och BIM på byggarbetsplatser (i praktiken). Den information som framkom från teoretisk kunskap och praktiska erfarenheter analyserades för att kartlägga förutsättningar och tillämpbara områden där BUB kan inkluderas i arbetet med APD-planer och tidsberoende BIM-modeller. Detta för att kunna överbrygga gapet som finns mellan BUB, APD-planer och användandet av BIM på byggarbetsplatser. De identifierade områden som framtagits är planering, kommunikation samt kontroll och uppföljning. För att kunna arbeta med BUB och skedesstyrda APD-planer i BIM inom de identifierade områdena finns det krav på vissa grundläggande förutsättningar. För att kunna ta fram APD-planer och göra dessa skedesstyrda i BIM-modellen krävs det utbildning för att få nödvändig kunskap och kompetens hos både projekteringen och produktionen. Det kommer också krävas ett tidigt samarbete mellan produktionen och projekteringen för att täcka alla kompetensområden som behövs vid planering av produktionen av en byggnad med BIM. För att kunna projektera APD-planer i BIM är det även en förutsättning att alla discipliner arbetar i BIM-modellen. Saknas det information, exempelvis landskap, går det inte att göra fullständiga APD-planer över byggområdet i BIM. Att ta fram skedesstyrda APD-planer där BUB inkluderas i en BIM-modell har i denna studie visat sig vara fördelaktigt inom flera områden. Att planera BUB tillsammans med APD-planer ivgör att brandskyddet på byggarbetsplatsen kan planeras med hänsyn till produktionen och att kraven går att genomföra utan att produktionen blir lidande. Med skedesstyrda APD-planer i en BIM-modell blir det möjligt att visualisera förändringarna på byggarbetsplatsen och på så vis även förutspå vilka brandrisker som uppkommer under olika skeden i byggnationen. BUB inkluderat i en BIM-modell kan vara ett verktyg för att förbättra kommunikationen på byggarbetsplatsen. Detta genom att informationen som läggs in blir mer projektspecifik vilket leder till att BUB blir lättare att förmedla, tydligare att följa och mer förståelig. Med bättre information och ökad kunskap om BUB kan kontroll och uppföljning utföras effektivare och därmed förbättra brandskyddet genom att kontrollerna utförs med en högre kvalité. Detta ger förhoppningen om att brandskydd under byggtid blir en större del av planering och projektering av byggarbetsplatsen samt leder till en säkrare byggarbetsplats.
In case of a fire at a construction site there is a risk of personal injury, property damage and stop in the building production that may be costly. There are shortcomings in the planning of fire safety at the construction site and at different construction methods. The planning of fire safety at construction sites are also in need of improvements according to how a construction site, and thus risks of fire, change during construction production. This by planning the fire safety along with the production of the building and that the fire safety is presented on workplace disposition plans. Fire protection design is mostly not included in the digital work method that Building Information Modeling (BIM) implies. The fact that the fire consultant is not involved with and works in BIM means that the benefits of collaboration between different disciplines cannot be utilized. The research on fire protection in BIM today focuses on the design of the completed building and how fire protection can be included in BIM. There is currently no research regarding both fire safety at the construction site and BIM modelling of the construction site. This leads to a gap between BIM as a working method at the construction site and the planning of fire safety. Because of mentioned problem areas, the study’s purpose was to investigate improvements for fire safety on construction sites. This by mapping out conditions and applicable areas where fire safety can be included in the planning of workplace disposition plans in time-dependent BIM models. The aim of the study was to provide a basis for future work methods in which fire safety, workplace disposition plans and BIM at construction sites are used together. To fulfill the purpose, a literature study and an interview study were conducted. The literature study was conducted to review published material regarding fire safety, construction site planning with workplace disposition plans, BIM at the construction site and BIM with fire safety design. Interviews were conducted to gain an insight into how people use fire safety documents, workplace disposition plans and BIM on construction sites (in practice). The information derived from theoretical knowledge and practical experience was analyzed to map the conditions and applicable areas where fire safety can be included in the planning of workplace disposition plans and time-dependent BIM models. This to bridge the gap between fire safety, workplace disposition plans and the use of BIM on construction sites. The identified areas that have been established are planning, communication and control and follow-up. To be able to work with fire safety and workplace disposition plans in time-dependent BIM model within the identified areas, there are some basic conditions that needs to be fulfilled. To be able to develop workplace disposition plans and make these time-dependent in the BIM model, education is needed to get the necessary knowledge and skills in both the design and production. There also needs to be an early collaboration between production and design to cover all areas of expertise needed in planning the production of a building with BIM. To be able to design workplace disposition plans in BIM, it is also a prerequisite that all disciplines work in the BIM model. If there is no information, such as information of the landscape, it is not possible to complete workplace disposition plans over the whole construction site in BIM. To develop time-dependent workplace disposition plans where fire safety are included in a BIM model, this study has proven to be beneficial in several areas. Planning the fire safety together with workplace disposition plans allows the fire protection at the construction site to be planned viregarding production and that the fire safety requirements can be implemented without the production being compromised. Time-dependent workplace disposition plans in a BIM model make it possible to visualize the changes at the construction site, thus predicting fire risks during different stages of the construction. Fire safety included in a BIM model can be a tool for improving communication at the construction site. This is because the information about the fire safety on construction sites inserted becomes more project-specific, which means that the information about the fire safety requirements can be easier to convey, clearer to follow and more understandable. With better information and increased knowledge about fire safety on construction sites, control and follow-up can be performed more effectively and therefore improving the fire safety by performing the controls with a higher quality. This gives the hope that fire protection during construction will be a major part of planning and designing the construction site and that this will lead to a safer construction site.

The purpose of this study is to achieve an understanding of how a CE- marking process is conducted and to identify the relevant factors that must be considered in such a process. We have conducted our study at Lövhults Svets & Smide AB (Lövhults) in Skruv, Småland Sweden, which are manufacturing brackets for small covering constructions. To understand how a CE-marking process is conducted several documents and provisions have been reviewed to achieve a basic understanding and insight of the subject. It thus led to that guideline ETAG 015 were studied and the factors to be considered in the CE-marking of brackets were identified. Together with Jan-Åke Johansson at Lövhults we agreed on four different brackets to investigate for a potential CE-marking. When these brackets had been selected a thorough investigation of these products was conducted, which then were compared with the provisions contained within ETAG 015. It states factors regarding the mechanical resistance, fire safety, environment, health, safety and usefulness that are to be considered. These factors should be specified and given a value / explanation which can be determined by European standards, calculation, calculation and testing, or only through testing. These calculations and tests shall be performed by the company or by a notified body. For a CE-marking to be possible to conduct it is mandatory to examine the manufacturing process of the products. Lövhults products are made of steel (Ymagine D1), which is processed in a punching machine, a bending machine, and finally a welding machine. After this processing, the products are sent for galvanizing and after which they are delivered back to Lövhults for dispatch to the customer. A production control procedure must be established and documented to ensure the quality of the manufactured products. The production control that we propose is simple in nature and is based on visual inspection of incoming materials, visual inspection of the work performed at each processing station and finally a visual check of incoming galvanized products. The manufacturing control needs to be approved by a notified body before it can be considered valid. The result of this study is that several correcting actions must be performed and that contact must be taken with a notified body to ensure that Lövhults products meet all the requirements that are demanded and thereby enable the products to receive a CE-marking. We have a discussion at the end of the report, resulting in the final conclusions and recommendations on whether the CE marking of Lövhults products is something that is worth investing in or not.
Denna studies syfte är att uppnå förståelse kring hur en CE-märkningsprocess går till och att kartlägga de faktorer som måste beaktas i en sådan process. Vi har utfört vår studie på Lövhults Svets & Smide AB (Lövhults) i Skruv, Småland, som producerar vinkelbeslag för täckande konstruktioner av mindre storlek. För att ta reda på hur en CE-märkningsprocess går till har ett flertal dokument och bestämmelser studerats för att skapa en grundläggande förståelse och insikt kring ämnet. Det ledde således till att riktlinje ETAG 015 studerades och att de faktorer som skall beaktas vid en CE-märkning av vinkelbeslag identifierades. Vi kom tillsammans med Jan-Åke Johansson på Lövhults överens om att undersöka fyra olika vinkelbeslag för en potentiell CE- märkning. När vinkelbeslagen valts ut genomfördes en noggrann produktgranskning som sedan ställdes mot de bestämmelser som återfinns i ETAG 015. Där utpekas faktorer gällande mekanisk motståndskraft, brandsäkerhet, miljö, hygien, säkerhet och användbarhet som skall beaktas. Dessa faktorer skall specificeras och ges ett värde/förklaring vilket kan fastställas via europeiska standarder, beräkning, beräkning och provning eller enbart via provning. Dessa beräkningar och provningar utförs av företaget eller av ett anmält organ. För att en CE-märkning ska vara möjlig måste även den tillverkningsprocess som produkterna i fråga genomgår granskas. Lövhults produkter tillverkas av stål (Ymagine D1) vilket bearbetas i en stansmaskin, bockningsmaskin och slutligen en svetsmaskin. Efter denna bearbetning skickas produkterna iväg för galvanisering och återkommer sedan till Lövhults för utleverans till kund. En plan för tillverkningskontroll ska upprättas och dokumenteras för att säkerställa kvalitén på de tillverkade produkterna. Den tillverkningskontroll som vi föreslår är av enkel natur och grundar sig på visuell kontroll av inkommande material, visuell kontroll av utfört arbete vid varje bearbetningsstation och slutligen en visuell kontroll inkomna av galvaniserade produkter. En tillverkningskontrollplan ska godkännas av ett anmält organ innan den kan anses giltig. Resultatet av denna undersökning är att ett flertal åtgärder måste vidtas och att kontakt med ett anmält organ måste tas för att Lövhults produkter ska uppfylla kraven som efterfrågas och därmed gå att CE-märka. Vi för en diskussion i slutet av rapporten vilket resulterar i slutsatser och rekommendationer gällande huruvida en CE-märkning av Lövhults produkter är något som är värt att satsa på eller inte.
Detta arbete är utfört som en fallstudie på Lövhults Svets & Smide AB (Lövhults) med intentionen att försöka skapa ett underlag för CE-märkning av de vinkelbeslag som företaget tillverkar. Tillsammans med företaget pekades fyra vinkelbeslag ut som lämpliga kandidater för en potentiell CE-märkning. För att erhålla kunskap och förståelse kring hur en CE-märkning av vinkelbeslag går till studerades dokument, standarder och bestämmelser från Europeiska Unionen vilket slutligen ledde oss till riktlinje ETAG 015. Denna riktlinje innefattar de bestämmelser som man skall förhålla sig till vid en CE- märkning av vinkelbeslag och den fungerar därmed som en teoretisk grundplattform. Utifrån detta dokument identifierades de faktorer som är relevanta att beakta för de fyra utvalda vinkelbeslagen hos Lövhults. En noggrann undersökning och granskning av produkterna genomfördes för att erhålla önskade specifikationer som sedan ställdes sedan mot de utpekade krav som återfinns i ETAG 015 för att kontrolla produkternas överensstämmelse. Analysen av denna jämförelse resulterar i slutsatsen att ett flertal åtgärder måste vidtas på produkterna och att en tillverkningskontroll behöver implementeras. Vidare förs en diskussion kring de för- och nackdelar en CE- märkning innebär av Lövhults vinkelbeslag. Rapporten avslutas med våra rekommendationer som baseras på de presenterade slutsatser som genererats.

For the past year’s climate change has been a hot topic for the world leaders and organizations, with discussions regarding how to reduce the environmental impact. The construction- and real estate sector are responsible for majority of the greenhouse emissions and other pollutants that affects the global climate. The energy consumption from operational phase has long been the main cause to the environmental impact but lately studies and research has brought increasedattention to the fact that the construction phase may have a greater significant to a building’sclimate impact.The purpose of this study is to investigate and identify the key factors and building parts that contributes the most to greenhouse emissions for the residential building during the construction phase. The results that are presented is based on life cycle analysis data (LCA) and calculated with a LCA tool called Byggsektorns miljöberäkningsverktyg (BM 1.0) from IVL.The conclusions this paper presents is that the product phase stands for most of the environmental impact during the construction phase with material as the key contributor. It shows that the choice of materials and products plays a crucial role for a buildings total impact. Transport and construction production have a minor impact compared with the product phase.

Isolator displacements, floor accelerations, roof displacements, base shear and torsional moments are basic parameters that are considered in the design of seismically isolated structures. The aim of this study is to evaluate the effects of bidirectional earthquake excitations of near fault records on the response of base isolated structures in terms of basic parameters mentioned above. These parameters computed from nonlinear response history analysis (RHA) and they are compared with the parameters computed from equivalent lateral force procedure (ELF). Effect of asymmetry in superstructure is also examined considering mass eccentricity at each floor level. Torsional amplifications in isolator displacements, floor accelerations, roof displacements and base shear are compared for different level of eccentricities. Two buildings with different story heights are used in the analyses.The building systems are modeled in structural analysis program SAP2000. The scaling of ground motion data are taken from the study of &ldquo
Response of Isolated Structures Under Bi-directional Excitations of Near-fault ground Motions&rdquo
(Ozdemir, 2010). Each ground motion set (fault normal and fault parallel) are applied simultaneously for different range of effective damping of lead rubber bearing (LRB) and for different isolation periods.

The aim of my diploma thesis is to design the object of a chalet, which is intended for recreation, boarding and accommodation. The accommodation is designed for 16 people in the form of tourist accommodation. The land, on which the proposed building is located, is on a slight slope, in an uninterrupted area in the protected landscape area of Poľana. Access to the land is secured by asphalt road from the northeast side of the land. It is also accessible by a tourist route from the southeastern side. The affected area is located approximately 10 km from the nearest village Hriňová. In the past, the site was often used for recreation. At a distance of 1 kilometer is the old mountain hotel Poľana, which is out of operation, but provides only temporary accommodation. The new chalet should return tourism to this area and increase the interest of tourists. The underground floor has a separate service for servicing and borrowing sports equipment. The building has one underground floor partially embedded in the terrain, from the south side accessible for the public. Two above-ground floors are made up of CLT panels, the first serving for a restaurant and a private dwelling unit, the second one for accommodation. The underground floor is designed with concrete filling blocks. The roof is a saddle, made of wooden collar construction. On the south side of the building is a large dormer.

Vom Baustaub umwölkt, vom Kreischen der Sägen betäubt und von den Chancen einer Neupositionierung beflügelt feiert das Deutsche Buch- und Schriftmuseum der Deutschen Nationalbibliothek in diesem Jahr seinen 125. Geburtstag. 1884 als Deutsches Buchgewerbemuseum in Leipzig gegründet gehört es zu den weltweit ältesten und nach Umfang und Qualität der Bestände bedeutendsten Museen auf dem Gebiet der Buchkultur.

A confined masonry (CM) wall consists of a masonry wall panel surrounded by reinforced concrete (RC) members on its perimeters. Low-rise CM structures are widely used in earthquake-risked (EQ-risked) rural or suburban areas all over the world. Most of these structures fail in shear pattern under lateral EQ loads, and some of them collapse under a severe or even a moderate EQ due to inappropriate design. On the other hand, buildings constructed of RC frames have much better performance in resisting EQs, since their RC members have larger dimensions and heavier reinforcing ratios than those in CM structures. Nonetheless, RC-frame buildings are normally too expensive for most inhabitants in less developed regions. In this study, as an improvement to the conventional CM buildings for EQ resistance and for the sake of post-EQ restoration, a hybrid masonry – RC (HMR) structure, whose working mechanism is different from that of a conventional CM structure, is proposed. The RC members (i.e. “tie beams” and “tie columns”), which function only as confinement in a CM building, will resist most of gravity load and part of lateral EQ load in an HMR structure, while the wall panels will take most of lateral EQ load and part of gravity load. This is achievable by slightly increasing the sizes and reinforcing ratios of RC members in HMR structures. Such buildings will not collapse in the absence of masonry wall panels because the gravity load bearing system is still intact. On the other hand, as the wall panels in the proposed HMR structure will absorb most of the energy induced by lateral EQ load, severe damages will be controlled within the wall panel region, so that only the wall panels need to be replaced instead of rebuilding the whole structure after the EQ event. To investigate the mechanical behaviours of masonry assemblages to be used in HMR structures, a series of experimental tests were conducted. Having established the relevant material properties for HMR structures, finite element (FE) simulation was performed to verify its work mechanism. Prior to applying the FE simulation to HMR structures, the FE technique was first applied to simulate the behaviours of two concrete-brick masonry panels under diagonal compression loading and a CM wall under cyclic lateral loading. The results show a good correlation between the experimental results and the simulated ones. This has validated the feasibility of using the FE software to study the proposed HMR structure. The theoretical simulation results show that in a properly designed HMR wall, depending on the masonry reinforcing details and the boundary conditions of simulated load cases, about 70% of the gravity load imposed on the RC beam will be transferred to the RC columns and more than 80% of the seismic energy (in terms of strain energy) will be absorbed by the masonry panel. Therefore, it is obvious that the proposed HMR structure is very feasible to replace the conventional CM structure in resisting EQ attacks with no risk of collapse.
published_or_final_version
Civil Engineering
Master
Master of Philosophy

The base tGSt method has been proposed by Carballo, Holzer and Murray [5] as a means of determining the strength of standing seam roof systems under gravity loading. The objective of this thesis is to evaluate the accuracy of the base test method. To do this, eleven sets of tests were performed at Virginia Polytechnic Institute & State University (VPl&SU). Each test set consisted of a single span base test from which a failure load was predicted for the corresponding three span confirming test. Results of two test sets recorded in Reference [5] were also used to evaluate the method. A secondary objective of this thesis is to comment on the effects that system components (purlin orientation, clip type, bracing configuration, panel type, insulation and purlin type) have on the strength of the system. Results from proprietary tests conducted at VPI & SU were used in conjunction with the results from this research to accomplish the secondary objective.
Master of Science

碩士
國立臺灣科技大學
營建工程系
102
This study is using numerical analysis software PFC2D to simulate microcrack development of rock with one regular set of joint and development of principle stress on hill slopes under building loading. The building near slope on the assumed that the rock slope angle is 45° with slope height 150m. Microcrack initiation and developmental are analyzed under the combination of five different recessional distances (0、B/2、B、2B、5B) and eight different dip angles (no joint、0°、15°、30°、45°、60°、75°、90°) where B=30m is the width of the building. The principal stress adjustment near slope summit and toe are also analyzed. The analytic results show that the microcrack development is determined by shear strength of the rock on the basis of Mohr-Coulomb criterion if no joint exists in rock slope. However, the microcrack development in jointed rock slope is different. At the beginning stage of the microcrack development is extended along the main jointed, then it spreads. The shape of microcrack fully development of final stage in no jointed flat is similar to isobars in intact rock. The microcrack development is related to the direction of stress path. Finally, qualitative and quantitative conclusions relating microcrack development under loading in rock slope are proposed for engineering reference.

M.Ing.
This research project was initiated by a well-known international company (MAKRO SA), which had experienced floor joint problems occurring in their industrial floors. Floor joint problems i.e. joint damage and spalling of the joint area result, from a combination of construction workmanship and quality control problems, as well as from operational hard wheeled vehicle loading conditions. Damaging and spalling of joint edges are general problems occurring on warehouse floor slabs because of hard wheeled loads trafficking joints. In addition, joint filler detachment from the joint wall surface looks aesthetically poor and leaves the possibility of hygienic problems developing. In the case of MAKRO SA stores, the above problems are not acceptable and should be avoided at all costs. The objective of the report is to investigate solutions to solve the problem of joint damage in industrial floors due to problems occurring in practice, as described below. Floor joint edge problems are a result of three main reasons. First, subsoil quality. The quality of the subsoil is determined by the compaction effort and type of filler materials used, which in turn determine the amount of deflection that will be detected at joint edges. Subgrade quality determines whether deflection of the top concrete layer will occur. Poor compaction and filler material contributes to excessive deflection occurring due to inadequate support of the concrete floor slabs. Water penetration through the floor slab results in the fines of the subsoil being eroded or washed out, resulting in a less dense material, which will deflect under large vehicle and store racking loads. It is concluded that good quality subsoil conditions will result in less deflection and level irregularities of the top concrete floor slab, resulting in less joint damage and spalling. Secondly, the effect of floor and joint workmanship on damage and joint edge spalling. Level irregularities occur due to poor troweling or floating efforts at the joint area. Poor joint edge workmanship results from incorrect formwork removal from the joint wall resulting in a damaged joint edge and additional spalling of the joint to that occurring from wheel load impact. Joints undergo damage as forklifts traffic the joint area as wheel load and energy

碩士
中原大學
土木工程研究所
100
With economic development, national income get better, a lot of large and complex structure successive built, the common feature of those are the construction of large-scale, wide range, long time, complex process. When the construction projects develop rapidly, there are more construction accidents increasingly, effect life and construction progress. The desire to be able to be more direct and effectively simulate the behavior of construction, this paper will attempt to employ the vector form intrinsic finite element method to analysis and establish the composition of construction simulation program from the beam and rod member, simulate the structural construction of geometry, loads and restrained conditions with the construction of the mechanical behavior. When we employ the vector form intrinsic finite element method, the calculation of the motions and structure elements in component points are independent, does not require the formation of structural units and the whole question of those stiffness matrices, each structural unit of the force - displacement only need to know, and the corresponding internal force calculation and component points of the internal forces superimposed, therefore it’s very convenient to introduce the numerical models or material of the experimental relationship, and that’s also very suitable to simulate the geometry, loads, restrained conditions with time change.

Dans ma mémoire, j’ai discuté les concepts d’arbitrage comme méthode de résolution d’un litige et par après, je donne un court historique de l’acceptation d’arbitrage au Québec. Le Chapitre I étudie la structure des règlements du R.B.Q., qui est un gendre d’arbitrage obligatoire institutionnelle, et j’inclus les diverses procédures dans ce système d’arbitrage. La sécurité offert par le plan de garantie règle par le R.B.Q. est discuté dans le Chapitre II en autant qu’il est relié avec le system d’arbitrage R.B.Q., y compris la structure du plan et le contenu de la sécurité. Chapitre III parle des recours disponible aux Bénéficiares ainsi que les avantages et désavantages de l’arbitrage sous les Règlements du R.B.Q. Un court étude comparative de quatre autres juridictions est recherché en Chapitre IV, incluant notre voisin, Ontario, les Etats-Unis et on croise dans les juridictions de Royaume Unie et Allemagne. En conclusion, j’établis que notre système d’arbitrage sous le Règlement protéges notre publique plus que d’autres juridictions. Je suggère des améliorations au système, par contre, incluant l’agrandissement du plan de garantie, l’ajout des pouvoirs donnés aux arbitres américains et ensuite d’intègré un système d’arrêt semblable aux Royaumes Unis.
In my memoire, I discuss the concept of arbitration generally as a dispute resolution method after which I outline a history of its acceptance under Quebec law. Chapter I addresses the structure under the R.B.Q. Regulations, which is a mandatory institutional arbitration system is discussed, and includes the various procedures of the arbitration system. The security offered under the Guarantee Plan which is regulated by the R.B.Q. is discussed in Chapter II insofar as it affects its arbitration system, including the structure of the guarantee plan and the contents of the guarantee. Chapter III reviews a Beneficiary’s available recourses as well as the advantages and limitations of the arbitration system under the Regulations. Then a brief comparative study with four other jurisdictions is directed in Chapter IV, including our neighbouring Ontario, United States, and then overseas to the United Kingdom and Germany. In conclusion, I prove that the arbitration system protects Quebec Beneficiaries more than any where else that I have studied and recommend improvements to the system, including the expansion of the guarantee plan, the addition of powers to the arbitration similar to those granted in the United States jurisdictions and the integration of an adjudication system similar to that used in the United Kingdom for construction dispute resolution.

碩士
國立臺北科技大學
土木與防災研究所
93
All investigation on the seismic behaviors of crane structures was conducted following the collapse of two tower cranes during the construction of the 101-story Taipei financial Center in the 2002 Hualien(331) Earthquake originated 44 kilometers off the east coast of Taiwan. Analysis was carried out on computer models representing various construction stages of typical tall building structure through both response spectrum and time-history analyses to estimate the possible seismic load that would be inflicted on the crane structure. A comparison was made between results of these two approaches to verify that whether the spectrum analysis is able to yield an accurate result based on acceleration record obtained at the location where the crane was mounted. The result of this analysis showed that in the absence of eccentricity, the spectrum method was able to produce satisfactory results while requiring minimal calculation. However, if the crane was allocated away from the center of rigidity, a twisting motion may take over the vibration of building, which would affect the accuracy of the spectrum method.

碩士
中國科技大學
建築研究所
95
According to “Venice Charter” 1964, the principle of conservation must be based on the culture of the monument. Since there have been different period in the history of Taiwan, the characteristics of the culture is diversified. Therefore, the conservation of monuments is much more complicated and challenging. Thus, the conservation and recovery of monument must also consider the particularity of historical development. Then the historical information and value will be understood further as the fundamental of conservation and recovery. Through the Nara Document on Authenticity in 1994, the western view of recovery is extended to oriental. Other than the information of the monuments to be recovered, the identity and experience of the local culture is also a present of authenticity. For the objective and strategy of conservation, they should be indicated in the investigation and planning stage. Besides, through the follow-up procedures, they are gradually be confirmed and implemented concretely. The pursuit of the authenticity is a basic concept and attitude. The continuously deliberation and demonstration are the concrete process of pursuing the authenticity. This view is the same as the spirit of management proposed by ISO. It is to say there is no effective quality management unless there is constant circulation and feedback (PDCA). This study adopts the construction quality of historic monuments recovery as the topic. Through the introduction of ISO 9000 and Three Stage Quality Control System (三級品管制度) to the historic monuments recovery model, the reference of conservation for the future is established. This study has been divided into several parts. In the first part, the spirit and view of ISO 9000 will be studied. It will also integrate with "Three Stage Quality Control" system to analyze the operating infrastructure of quality control. In the second part, through the above-mentioned characteristics, it is introduced to the construction quality of historic monuments recovery. In addition, through the design, construction and the checking stage, the quality control system for monuments recovery will be developed. Moreover, the focal points of management in each recovery stage will be analyzed further. In the third part, the "Masonry Construction" is taken as an example to study the procedure of masonry construction recovery and the contents of detailed construction proposal. In the construction method aspect, the major points of implementation are proposed and the major points of quality control are interpreted. Comparing the relevant results in the final stage of study, the achievements are induced as follows: 1. The terms, damage situation and recovery method of the masonry construction are analyzed. With the spirit of "Three Stage Quality Control" and the comprehensive characteristics mentioned above, the procedure of masonry construction recovery and the contents of detailed construction proposal will be studied. 2. The procedure of masonry construction recovery is established. The disintegration and clearing up are included in the preparation of recovery. The scope is defined from tender to the entering of recovery stage. Through the study of information of disintegration and clearing up, it is regarded as the information for assessment of the recovery method of masonry construction of historic monuments. Besides, the focus of implementation of traditional and conserved technical construction method are established. In the operation procedure, the proposed checkpoints for judgments are critical for the implementation of this infrastructure. 3. There are three stages of historic monuments recovery, including "design", “implementation" and "inspection". With the characteristics of ISO 9000, the quality control system of construction of historic monuments recovery is developed. The important items of quality control and focuses of control in different stages of activity are included in the description of the procedure of historic monuments recovery.